HD 201298

Last updated
HD 201298
Equuleus constellation map.svg
Red circle.svg
Location of HD 201298 (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Equuleus
Right ascension 21h 08m 28.1388s [1]
Declination +06° 59′ 21.6948″ [1]
Apparent magnitude  (V)6.14 [2]
Characteristics
Evolutionary stage red giant branch? [3]
Spectral type M0 III [4]
U−B color index +1.97 [5]
B−V color index +1.66 [5]
Astrometry
Radial velocity (Rv)20 ± 2 [6]  km/s
Proper motion (μ)RA: −10.643  mas/yr [1]
Dec.: +2.479  mas/yr [1]
Parallax (π)2.8646 ± 0.0533  mas [1]
Distance 1,140 ± 20  ly
(349 ± 6  pc)
Absolute magnitude  (MV)−1.57 [note 1]
Details
Mass 1.83 [7]   M☉
Radius 117 [7]   R☉
Luminosity 1,648 [8]   L☉
Surface gravity (log g)0.413 [9]   cgs
Temperature 3,732 [8]   K
Rotational velocity (v sin i)4.5 ± 1 [10]  km/s
Other designations
12 G. Equueli, AG+06°2888, BD+06°4754, FK5  3692, GC  29548, HD  201298, HIP  104357, HR  8090, SAO  126566 [11] [12]
Database references
SIMBAD data

HD 201298 (HR 8090) is a solitary star located in the northern constellation Equuleus just next to 3 Equulei It has an apparent magnitude of 6.14, [2] making it barely visible to the naked eye under ideal conditions. The star is situated at a distance of 1,140 light years [1] but is drifting away with a heliocentric radial velocity of 20  km/s . [6]

HD 201298 has a stellar classification of M0 III, indicating that it is ageing M-type star [4] that is probably on the red giant branch. [3] As a result, it has expanded to 117 times the Sun's girth. [7] At present it has 1.83 times the mass of the Sun [7] and shines with a luminosity of 1,648  L☉ from its enlarged photosphere at an effective temperature of 3,732 K, [8] which gives it an orange glow. HD 201298 spins leisurely with a projected rotational velocity of 4.5±1  km/s , [10] slightly faster than most giants.

Note

  1. ↑ Calculated using this equation:

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References

  1. 1 2 3 4 5 6 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics . 649: A1. arXiv: 2012.01533 . Bibcode:2021A&A...649A...1G. doi: 10.1051/0004-6361/202039657 . S2CID   227254300. (Erratum:  doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. 1 2 Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN   1063-7737. S2CID   255204555.
  3. 1 2 Gontcharov, G. A. (October 2011). "The red giant branch in the Tycho-2 catalogue". Astronomy Letters. 37 (10): 707–717. arXiv: 1607.00557 . Bibcode:2011AstL...37..707G. doi:10.1134/S1063773711090040. ISSN   1063-7737. S2CID   119272127.
  4. 1 2 Henry, Gregory W.; Fekel, Francis C.; Henry, Stephen M.; Hall, Douglas S. (September 2000). "Photometric Variability in a Sample of 187 G and K Giants". The Astrophysical Journal Supplement Series. 130 (1): 201–225. Bibcode:2000ApJS..130..201H. doi: 10.1086/317346 . ISSN   0067-0049.
  5. 1 2 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1 January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  6. 1 2 Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication: 0. Bibcode:1953GCRV..C......0W.
  7. 1 2 3 4 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv: 2109.10912 . Bibcode:2022A&A...657A...7K. doi: 10.1051/0004-6361/202142146 . eISSN   1432-0746. ISSN   0004-6361.
  8. 1 2 3 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (21 November 2012). "Fundamental parameters and infrared excesses of Hipparcos stars: Parameters and IR excesses from Hipparcos". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–357. arXiv: 1208.2037 . Bibcode:2012MNRAS.427..343M. doi: 10.1111/j.1365-2966.2012.21873.x . ISSN   0035-8711.
  9. ↑ McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv: 1706.02208 . Bibcode:2017MNRAS.471..770M. doi: 10.1093/mnras/stx1433 .
  10. 1 2 de Medeiros, J. R.; Mayor, M. (November 1999). "A catalog of rotational and radial velocities for evolved stars". Astronomy and Astrophysics Supplement Series. 139 (3): 433–460. Bibcode:1999A&AS..139..433D. doi: 10.1051/aas:1999401 . ISSN   0365-0138.
  11. ↑ "HD 201298". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved June 20, 2022.
  12. ↑ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
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